package com.tanhua.server.service;

import cn.hutool.core.collection.CollUtil;
import cn.hutool.core.util.PageUtil;
import com.alibaba.cloud.commons.lang.StringUtils;
import com.github.tobato.fastdfs.domain.conn.FdfsWebServer;
import com.github.tobato.fastdfs.domain.fdfs.StorePath;
import com.github.tobato.fastdfs.service.FastFileStorageClient;
import com.tanhua.autoconfig.template.OssTemplate;
import com.tanhua.commons.utils.Constants;
import com.tanhua.dubbo.api.UserInfoApi;
import com.tanhua.dubbo.api.VideoApi;
import com.tanhua.model.domain.UserInfo;
import com.tanhua.model.mongo.Video;
import com.tanhua.model.vo.ErrorResult;
import com.tanhua.model.vo.PageResult;
import com.tanhua.model.vo.VideoVo;
import com.tanhua.server.exception.BusinessException;
import com.tanhua.server.interceptor.UserHolder;
import org.apache.dubbo.config.annotation.DubboReference;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.cache.annotation.CacheEvict;
import org.springframework.cache.annotation.Cacheable;
import org.springframework.data.redis.core.RedisTemplate;
import org.springframework.stereotype.Service;
import org.springframework.web.multipart.MultipartFile;

import java.io.IOException;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
import java.util.Map;
import java.util.stream.Collectors;

@Service
public class SmallVideosService {
    @Autowired
    private OssTemplate ossTemplate;

    @Autowired
    private FastFileStorageClient client;

    @Autowired
    private FdfsWebServer webServer;

    @DubboReference
    private VideoApi videoApi;

    @DubboReference
    private UserInfoApi userInfoApi;

    @Autowired
    private RedisTemplate<String, String> redisTemplate;

    @Autowired
    private MqMessageService mqMessageService;

    /**
     * 完成小视频上传逻辑
     *
     * @param videoThumbnail 封面图片文件
     * @param videoFile      小视频文件
     */
    @CacheEvict(value="videos",allEntries = true)  //清空缓存
    public void  saveVideos(MultipartFile videoThumbnail, MultipartFile videoFile) throws IOException {
        if (videoFile.isEmpty() || videoThumbnail.isEmpty()) {
            throw new BusinessException(ErrorResult.error());
        }
        //1、将视频上传到FastDFS,获取访问URL
        String filename = videoFile.getOriginalFilename();  // abc.mp4
        filename = filename.substring(filename.lastIndexOf(".") + 1);  //这就是后缀
        StorePath storePath = client.uploadFile(videoFile.getInputStream(),
                videoFile.getSize(), filename, null);
        String videoUrl = webServer.getWebServerUrl() + storePath.getFullPath();
        //2、将封面图片上传到阿里云OSS，获取访问的URL
        String imageUrl = ossTemplate.upload(videoThumbnail.getOriginalFilename(), videoThumbnail.getInputStream());
        //3、构建Videos对象
        Video video = new Video();
        video.setUserId(UserHolder.getUserId());
        video.setPicUrl(imageUrl);
        video.setVideoUrl(videoUrl);
        video.setText("地地道道的麻辣味。湖南平江");

        //4、调用API保存数据
        String videoId = videoApi.save(video);
        if (StringUtils.isEmpty(videoId)) {
            throw new BusinessException(ErrorResult.error());
        }
        //发送mq消息
        mqMessageService.sendLogMessage(UserHolder.getUserId(),"0301","video", videoId);
    }

    /**
     * 实现分页查询小视频列表方法
     *
     * @param page
     * @param pagesize
     * @return
     */
    @Cacheable(
            value="videos",
            key = "T(com.tanhua.server.interceptor.UserHolder).getUserId()" +
                    "+'_'+#page+'_'+#pagesize")//userid _ page_pagesize
    public PageResult queryVideoList(Integer page, Integer pagesize) {
        //1、查询redis数据
        String redisKey = Constants.VIDEOS_RECOMMEND + UserHolder.getUserId();
        String redisValue = redisTemplate.opsForValue().get(redisKey);
        //2、判断redis数据是否存在，判断redis中数据是否满足本次分页条数
        List<Video> list = new ArrayList<>();
        int redisPages = 0;
        if (!StringUtils.isEmpty(redisValue)) {
            //3、如果redis数据存在，根据VID查询数据
            String[] values = redisValue.split(",");
            //判断当前页的起始条数是否小于数组总数
            if ((page - 1) * pagesize < values.length) {
                List<Long> vids = Arrays.stream(values).skip((page - 1) * pagesize).limit(pagesize)
                        .map(e -> Long.valueOf(e))
                        .collect(Collectors.toList());
                //5、调用API根据PID数组查询动态数据
                list = videoApi.findMovementsByVids(vids);
            }
            redisPages = PageUtil.totalPage(values.length, pagesize);//计算出Redis的总页数
        }
        //4、如果redis数据不存在，分页查询视频数据
        if (list.isEmpty()) {
            //page的计算规则，  传入的页码  -- redis查询的总页数
            list = videoApi.queryVideoList(page - redisPages, pagesize);  //page=1 ?
        }
        //5、提取视频列表中所有的用户id
        List<Long> userIds = CollUtil.getFieldValues(list, "userId", Long.class);
        //6、查询用户信息
        Map<Long, UserInfo> map = userInfoApi.findByIds(userIds, null);
        //7、构建返回值
        List<VideoVo> vos = new ArrayList<>();
        for (Video video : list) {
            UserInfo info = map.get(video.getUserId());
            if (info != null) {
                VideoVo vo = VideoVo.init(info, video);
                //当前用户对此视频作者是否关注了
                Boolean hasFocus = redisTemplate.hasKey("video_focus_" + UserHolder.getUserId() + "_" + video.getUserId());
                vo.setHasFocus(hasFocus ? 1 : 0);
                vos.add(vo);
            }
        }
        return new PageResult(page, pagesize, 0l, vos);
    }

    /**
     * 关注视频发布者
     * @param userId 关注的用户的id
     */
    public void followUser(Long userId) {
        //1.保存用户关注表
        videoApi.followUser(UserHolder.getUserId(), userId);

        //2.将关注状态保存到redis中
        redisTemplate.opsForValue().set(Constants.FOCUS_USER_KEY + UserHolder.getUserId() + "_" + userId, "1");


    }

    /**
     * 取消关注
     *
     * @param userId 被关注用户的id
     * @return
     */
    public void unfollowUser(Long userId) {

        //1.移除用户关注关系
        videoApi.disFollowUser(UserHolder.getUserId(), userId);

        //2.将保存在redis中的关注关系删除
        redisTemplate.delete(Constants.FOCUS_USER_KEY + UserHolder.getUserId() + "_" + userId);


    }


}